6. After opening the trade there are esseintally 4 steps!

a) You need to wait for 10 confirmations on the blockchain (I think the seller drops the whole sum of Monero onto a temporary wallet)
b) You are presented with credentials of the guy and you need to pay him the set amount with set method and set account the fiat money. (I used Wise and I just got his e-mail, it was sufficient) Then you press "I made my payment" thingy after it goes through (to probably notify him that he gotta release Monero after confirming a successful transfer).
c) Then the trader confirms he received his money properly and you get Monero
d) After the trade you again need to wait for at least 10 more confirmations on the blockchain now that the Monero is on a wallet that you control within Retoswap.

And you can transfer it to your main wallet. It may take some patience.
The transaction gets logged locally, that is it.
You can look up identification of that transfer from Retoswap to your own on the blockchain, you now own it.